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authorPatrick McHardy <kaber@trash.net>2013-04-05 20:42:05 +0200
committerDavid S. Miller <davem@davemloft.net>2013-04-05 15:38:10 -0400
commit124dff01afbdbff251f0385beca84ba1b9adda68 (patch)
tree57fe790d91b0d56df456f61b25cce398bc6f4271
parent34e2ed34a035de07277cca817fe8264324398141 (diff)
netfilter: don't reset nf_trace in nf_reset()
Commit 130549fe ("netfilter: reset nf_trace in nf_reset") added code to reset nf_trace in nf_reset(). This is wrong and unnecessary. nf_reset() is used in the following cases: - when passing packets up the the socket layer, at which point we want to release all netfilter references that might keep modules pinned while the packet is queued. nf_trace doesn't matter anymore at this point. - when encapsulating or decapsulating IPsec packets. We want to continue tracing these packets after IPsec processing. - when passing packets through virtual network devices. Only devices on that encapsulate in IPv4/v6 matter since otherwise nf_trace is not used anymore. Its not entirely clear whether those packets should be traced after that, however we've always done that. - when passing packets through virtual network devices that make the packet cross network namespace boundaries. This is the only cases where we clearly want to reset nf_trace and is also what the original patch intended to fix. Add a new function nf_reset_trace() and use it in dev_forward_skb() to fix this properly. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/linux/skbuff.h4
-rw-r--r--net/core/dev.c1
2 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 72b396751de7..b8292d8cc9fa 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2641,6 +2641,10 @@ static inline void nf_reset(struct sk_buff *skb)
nf_bridge_put(skb->nf_bridge);
skb->nf_bridge = NULL;
#endif
+}
+
+static inline void nf_reset_trace(struct sk_buff *skb)
+{
#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
skb->nf_trace = 0;
#endif
diff --git a/net/core/dev.c b/net/core/dev.c
index 13e6447f0398..e7d68ed8aafe 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1639,6 +1639,7 @@ int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
skb->mark = 0;
secpath_reset(skb);
nf_reset(skb);
+ nf_reset_trace(skb);
return netif_rx(skb);
}
EXPORT_SYMBOL_GPL(dev_forward_skb);